The standard process for dealing with translucent objects involves disabling writes to the depth buffer and sorting transparent objects and$/$or polygons based on distance to the camera.

a$)$ Explain why writes to the Z$-$buffer should be disabled.

b$)$ Explain why sorting is necessary using the following equation.

$C=$A over $B$ becomes

$c_C^{\text{'}}=c_A^{\text{'}}+(1-{}_A)c_B^{\text{'}}$